A PFT calculator, standing for Pulmonary Function Test calculator, is a medical tool used to interpret lung function test results. It compares a patient’s measured values such as FVC (Forced Vital Capacity), FEV1 (Forced Expiratory Volume in one second), and FEV1/FVC ratio against predicted values based on age, height, gender, and ethnicity. Deviation from predicted normal values helps clinicians identify and classify respiratory conditions like asthma, COPD, restrictive lung disease, or interstitial lung disease. The calculator is widely used by pulmonologists, respiratory therapists, and primary care physicians.
Pulmonary function tests are essential diagnostic tools in respiratory medicine, and the PFT calculator streamlines interpretation of the raw data produced by spirometry and diffusion capacity testing. Results are expressed as a percentage of predicted values, with values below 80 percent often indicating impairment. The calculator also helps classify severity of obstruction or restriction. Reference equations used in PFT calculators are based on large population studies and are regularly updated by organizations like the Global Lung Function Initiative. Understanding PFT results requires clinical context, so always have a qualified healthcare provider interpret the findings in the context of a full patient history and examination.